Self-healing mechanisms in smart protective coatings: A review

Self-healing materials are attracting increasing interest of the research community, over the last decades, due to their efficiency in detecting and “autonomically” healing damage. Numerous attempts are being presented every year focusing on the development of different self-healing systems as well as their integration to large scale production with the best possible property–cost relationship. The current work aims to present the most recent breakthroughs in these attempts from many different research groups published during the last five years. The current review focuses in polymeric systems and their composites. The reviewed literature is presented in three distinct categories, based on three different scopes of interest. These categories are (i) the materials and systems employed, (ii) the experimental techniques for the evaluation of materials properties and self-healing efficiency of the materials/structures and (iii) the characterization techniques utilized in order to evaluate (off-line) and monitor (on-line) the healing efficiency of the proposed systems. Published works are presented separately in all the different categories, thus the interested reader is advised to follow the structure of the review and refer to the chapter of interest.

Self-healing materials: A review of advances in materials, evaluation, characterization and monitoring techniques

A review on corrosion-protective extrinsic self-healing: Comparison of microcapsule-based systems and those based on core-shell vascular networks

Protective polymeric films for industrial substrates: A critical review on past and recent applications with conducting polymers and polymer composites/nanocomposites

Nonmetallic (based on polymers or oxides) and metallic protective coatings are used to protect metal products against the harmful action of the corrosion environment. In recent years, self-healing coatings have been the subject of increasing interest. The ability of such coatings to self-repair local damage caused by external factors is a major factor contributing to their attractiveness. Polymer layers, silica-organic layers, conversion layers, metallic layers and ceramic layers, to mention but a few, are used as self-healing coatings. This paper presents the main kinds of self-healing coatings and explains their self-healing mechanisms.

https://link.springer.com/content/pdf/10.1007%2Fs10853-013-7616-y.pdf

Self-healing coatings in anti-corrosion applications

Triethanolamine (TEA), a corrosion inhibitor for zinc and steel, was introduced into nano-sized particles as nanoreservoirs to increase longevity of inhibitive property and prevent degradation caused by direct addition of corrosion inhibitor into coating layer. TEA-incorporated nanoparticles with average particle size around 400–450 nm were successfully synthesized by sequential emulsion polymerization, occupying around 5% of total solid weight of particles during a neutralization process. Encapsulated TEA was released from the capsule inside when the pH level of environment became acidic or alkaline due to an acid–base interaction or ionization of seed material in specific conditions. In the corrosion tests, the encapsulated TEA decreased the corrosion rate of steel substrate owing to its adsorption on steel surface and the resistance of coating layer against corrosive environment was much higher and remained its resistance as immersion time increased when TEA was incorporated in coating layer in the encapsulated form. Based on the scanning vibrating electrode technique (SVET) result, anticorrosive ability of the encapsulated TEA seemed to improve due to the spontaneous passivation of exposed metal on the defected region of coated steel.

Encapsulation of triethanolamine as organic corrosion inhibitor into nanoparticles and its active corrosion protection for steel sheets

Encapsulation of aliphatic amines into nanoparticles for self-healing corrosion protection of steel sheets

The present invention relates to: a color ink composition for printed steel plates, the color ink composition having excellent adhesiveness, processability, and solvent resistance and the like with respect to steel plates; a method for manufacturing a printed steel plate using the color ink composition; and a printed steel plate manufactured according to the method. Specifically, the present invention relates to a color ink composition for steel material, the color ink composition comprising: 10 to 30 parts by weight of a mixture of a urethane acrylate oligomer and a different acrylate oligomer other than the urethane acrylate oligomer; 50 to 80 parts by weight of a photocurable monomer, which is a mixture of a monofunctional photocurable monomer and a difunctional or higher photocurable monomer; 5 to 20 parts by weight of a photoinitiator; 0.1 to 10 parts by weight of a pigment; and, in terms of dispersant solid content per 100 parts by weight of the pigment, 3 to 300 parts by weight of the dispersant, wherein the urethane acrylate oligomer and the different acrylate oligomer are mixed in a 1:1 to 10:1 weight ratio, and the monofunctional photocurable monomer and the difunctional or higher photocurable monomer are mixed in a 5:1 to 100:1 weight ratio. Moreover, the present invention specifically relates to a method for manufacturing a printed steel plate, the method comprising: a step for jetting, onto a steel plate, a color ink composition for steel plates; and a step for curing to form a print layer. Furthermore, the present invention specifically relates to a printed steel plate comprising: a steel plate; and a print layer formed on the steel plate using the color ink composition for steel plates according to the present invention.

Color ink composition having excellent adhesiveness for steel material, method for manufacturing printed steel plate using same, and printed steel plate manufactured according to same

Provided are a road sign and a method for manufacturing same, the road sign comprising: a steel plate; a color coating layer including reflective particles formed on the steel plate; and a printing layer formed on the color coating layer by using inkjet printing. The road sign manufactured by using the inkjet printing technique according to the present invention can minimize the peeling of characters or drawings from a material, thereby prolonging the life of the road sign while securing the visibility.

Road sign using inkjet printing and method for manufacturing same

The present invention provides a surface-treated metallic material with easy gloss control and a manufacturing method therefor, the surface-treated metallic material comprising: a metallic material; and a coating layer which is formed on at least one side of the metallic material and on which an ultraviolet curable coating composition is cured, wherein the coating layer consists of a plurality of protrusions, which have a volume of 3 to 16 pico liters and are arranged at a density of 5 to 610 per 1 mm2 of the metallic material As such, the surface-treated steel sheet is excellent in adhesion, scratch resistance and corrosion resistance, and has easy gloss control Further, a surface-treated steel sheet manufacturing method of the present invention provides a method for manufacturing a surface-treated steel sheet excellent in adhesion, scratch resistance and corrosion resistance, and also has an effect of easily controlling the gloss of the steel sheet

Choi Ha-Na

Papers

Encapsulation of triethanolamine as organic corrosion inhibitor into nanoparticles and its active corrosion protection for steel sheets

Encapsulation of aliphatic amines into nanoparticles for self-healing corrosion protection of steel sheets

Color ink composition having excellent adhesiveness for steel material, method for manufacturing printed steel plate using same, and printed steel plate manufactured according to same

Road sign using inkjet printing and method for manufacturing same

Surface-treated metallic material with easy control of glossiness and manufacturing method therefor